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Motson carburetor


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Guest DeSoto Frank

I wonder if it's a "Tillotson" ? Made in Toledo, O.

They were a common carb before WWII.

If it's running rich , I would start by checking the float-level.

Some of these older updrafts had an adjustable main-jet, if so, I would start-out by turning the needle-screw "in" until it lightly seats, then back it out 1-1/2 turns, then start the engine and run it until warm... (choke can be pushed all the way in).

Then turn the screw in 1/4 turn at a time, until the engine runs rough / stalls. Back screw out until the engine smooths-out, then keep going 1/4 turn at a time until the engine runs rough again... now slowly turn the screw back "in" about 1/2 way between the two points, and that should be very close.

Before tinkering too much with the carb, I would make sure all the plugs are clean & properly gapped, and that the points are also clean and properly gapped, and that the condensor is in good shape... burned points / bad condensor will cause and engine to buck and spit too.

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